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Improve mixer performance

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elasota
2021-04-10 23:56:25 -04:00
parent 7ae31bc7fc
commit b9fe553ff8
1 changed files with 10 additions and 2 deletions
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12
AerofoilSDL/GpAudioDriver_SDL2.cpp
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@@ -633,6 +633,7 @@ void GpAudioDriver_SDL2::RefillMixChunk(GpAudioChannel_SDL2 *const*channels, siz
m_mixChunkReadOffset = 0;
int16_t *mixChunkStart = m_mixChunk + m_mixChunkReadOffset;
int16_t audioNormalizeShift = 0;
for (size_t i = 0; i < numChannels; i++)
{
@@ -641,18 +642,25 @@ void GpAudioDriver_SDL2::RefillMixChunk(GpAudioChannel_SDL2 *const*channels, siz
if (i == 0)
{
noAudio = false;
audioNormalizeShift = 0x80;
for (size_t j = 0; j < samplesToFill; j++)
mixChunkStart[j] = (static_cast<int16_t>(audioMixBuffer[j]) - 0x80) * audioVolumeScale;
mixChunkStart[j] = static_cast<int16_t>(audioMixBuffer[j]);
}
else
{
audioNormalizeShift += 0x80;
for (size_t j = 0; j < samplesToFill; j++)
mixChunkStart[j] += (static_cast<int16_t>(audioMixBuffer[j]) - 0x80) * audioVolumeScale;
mixChunkStart[j] += static_cast<int16_t>(audioMixBuffer[j]);
}
}
if (noAudio)
memset(mixChunkStart, 0, samplesToFill * sizeof(mixChunkStart[0]));
else
{
for (size_t i = 0; i < samplesToFill; i++)
mixChunkStart[i] = (mixChunkStart[i] - audioNormalizeShift) * audioVolumeScale;
}
}